I think this lens is FF. My reasoning is because it says nothing, that's a clue that something else is coming from Pentax and they don't want to spoil the surprise.

So finaly Pentax made 560mm lens, for the price of $7,000, which is very expensive. Do you think this lens is designed for APS-C shooters? Who is going to buy it? very few if any, right? and what is this new HD coating?

If Pentax is capable to make a lens that nobody can buy, then they must have a camera coming to match it. (FF).